I have. Conjoined seeds, while not common for me, do happen every now and again.
The very first is the only planting that I made cursory notes of. Those first conjoined seeds grew their first year with what appeared to be a single crown with two fans. Each of the fans scaped at the same time at about the same height and opened their maiden blooms within one day of each other. The blooms looked identical to my eye (very plain with little possibility for improvement) and since the scapes showed nothing special in the way of bud count or branching, the plant was composted.
When digging the plant for compost, I did take note that the root system appeared to be much too large for a single crowned plant, but since I wasn't keeping it, it mattered not.